| CHAPTER I. | A CENTURY OF RAILROAD BUILDING |
| CHAPTER II. | THE COMMODORE AND THE NEW YORK CENTRAL |
| CHAPTER III. | THE GREAT PENNSYLVANIA SYSTEM |
| CHAPTER IV. | THE ERIE RAILROAD |
| CHAPTER V. | CROSSING THE APPALACHIAN RANGE |
| CHAPTER VI. | LINKING THE OCEANS |
| CHAPTER VII. | PENETRATING THE PACIFIC NORTHWEST |
| CHAPTER VIII. | BUILDING ALONG THE SANTA FE TRAIL |
| CHAPTER IX. | THE GROWTH OF THE HILL LINES |
| CHAPTER X. | THE RAILROAD SYSTEM OF THE SOUTH |
| CHAPTER XI. | THE LIFE WORK OF EDWARD H. HARRIMAN |
| CHAPTER XII. | THE AMERICAN RAILROAD PROBLEM |
The United States as we know it today is largely the result of mechanical inventions, and in particular of agricultural machinery and the railroad. One transformed millions of acres of uncultivated land into fertile farms, while the other furnished the transportation which carried the crops to distant markets. Before these inventions appeared, it is true, Americans had crossed the Alleghanies, reached the Mississippi Valley, and had even penetrated to the Pacific coast; thus in a thousand years or so the United States might conceivably have become a far-reaching, straggling, loosely jointed Roman Empire, depending entirely upon its oceans, internal watercourses, and imperial highways for such economic and political integrity as it might achieve. But the great miracle of the nineteenth century—the building of a new nation, reaching more than three thousand miles from sea to sea, giving sustenance to more than one hundred